Issue with Apocalypse Survival of the Fittest

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Situation: Apocalypse is firing Survival of the Fittest, which "Deals hits to the lowest-health enemy."

Opponent has three live characters, lowest health is Spider-Ham, who is airborne.
Result: Apocalypse targets Spider-Ham and does no damage.
Expected: Survival of the Fittest targets the lowest-health targetable enemy and ignores untargetable enemies.

Seems kinda silly that a specific targeting effect would select an untargetable enemy.